OFFSET
1,1
COMMENTS
The exponent is congruent to 1 mod 3.
LINKS
Samuel S. Wagstaff, Jr. The Cunningham Project
PROG
(PARI) is(n)=my(t=10^n\9); ispseudoprime(t) && #bnfisintnorm(bnfinit(z^2+z+1), t) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
V. Raman, Sep 08 2012
STATUS
approved